ARM: socfpga: move board select into mach-socfpga/Kconfig

Switch to a more standard way of board select; put the SoC select
into arch/arm/Kconfig and move the board select menu under
arch/arm/mach-socfpga/Kconfig.

Also, consolidate SYS_BOARD, SYS_VENDOR, SYS_SOC, SYS_CONFIG_NAME.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-socfpga/Kconfig b/arch/arm/mach-socfpga/Kconfig
new file mode 100644
index 0000000..204efca
--- /dev/null
+++ b/arch/arm/mach-socfpga/Kconfig
@@ -0,0 +1,27 @@
+if ARCH_SOCFPGA
+
+choice
+	prompt "Altera SOCFPGA board select"
+
+config TARGET_SOCFPGA_ARRIA5
+	bool "Altera SOCFPGA Arria V"
+
+config TARGET_SOCFPGA_CYCLONE5
+	bool "Altera SOCFPGA Cyclone V"
+
+endchoice
+
+config SYS_BOARD
+	default "socfpga"
+
+config SYS_VENDOR
+	default "altera"
+
+config SYS_SOC
+	default "socfpga"
+
+config SYS_CONFIG_NAME
+	default "socfpga_arria5" if TARGET_SOCFPGA_ARRIA5
+	default "socfpga_cyclone5" if TARGET_SOCFPGA_CYCLONE5
+
+endif